There isn't in his room.
A:something special
B:special something
C:special anything
D:anything special
已知在矩形ABCD中,AB=3,BC=6,如果以AD为直径作圆,那么与这个圆相切的矩形的边共有( )
下图四条山脉中,不属于我国地势三级阶梯分界线的是( )